<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <div id="app">
    <div>
      <span>姓名:</span>
      <input type="text" v-model="name" />
    </div>
    <div>
      <span>年龄:</span>
      <input type="number" v-model="age" />
    </div>
    <div>
      <span>性别:</span>
      <select v-model="sex">
        <option value="男">男</option>
        <option value="女">女</option>
      </select>
    </div>
    <div>
      <button @click="add()">添加/修改</button>
    </div>
    <div>
      <table border="1" cellpadding="10" cellspacing="0">
        <tr>
          <th>序号</th>
          <th>姓名</th>
          <th>年龄</th>
          <th>性别</th>
          <th>操作</th>
        </tr>
        <tr v-for="(item, index) in list" :key="item.id">
          <td>{{index}}</td>
          <td>{{item.name}}</td>
          <td>{{item.age}}</td>
          <td>{{item.sex}}</td>
          <td>
            <button @click="del(item.id)">删除</button>
            <button @click="gai(item.id)">编辑</button>
          </td>
        </tr>
      </table>
    </div>
  </div>
  <script src="https://cdn.bootcdn.net/ajax/libs/vue/2.7.14/vue.min.js"></script>
  <script>
    const app = new Vue({
      el: '#app',
      data: {
        list: [],
        name: '',
        age: '',
        sex: '',
        id: ''
      },
      methods: {
        add () {
          if (!this.id) {
            this.list.push({
              id: this.list.length + 1,
              name: this.name,
              age: this.age,
              sex: this.sex
            })
          } else {
            const obj = this.list.find(item => item.id == this.id)
            obj.name = this.name
            obj.age = this.age
            obj.sex = this.sex
          }


          this.name = this.age = this.sex = ''
        },
        del (id) {
          this.list = this.list.filter(item => item.id != id)
        },
        gai (id) {
          this.list.forEach(item => {
            if (item.id == id) {
              this.name = item.name
              this.age = item.age
              this.sex = item.sex
              this.id = item.id
            }
          })
        }
      },
    })
  </script>
</body>

</html>